Question

list the various ways of food preservation​

Answer 1

Among the oldest methods of preservation are drying, refrigeration, and fermentation

drying, refrigeration, and fermentation. Modern methods include canning, pasteurization, freezing, irradiation, and the addition of chemicals.

Advances in packaging materials have played an important role in modern food preservation.

Answer 2

Answer:

The various ways of food preservation:-

1. Pickling

• Food preserved in vinegar.

• Preserves meat, vegetables due to the action of acetic acid which prevents microbial growth

2. Salting

• Food preserved in salt such as fish, meat

•Salt prevent microbial growth

3. Smoking

• Smoking of fish and meat prevent spoilage by dehydration

• The wood smoke contains large number of compounds, which are anti microbial and slow rancidification of animal fats.

4. Canning

• It is a method of preserving food in which the food contents are processed and sealed in an airtight container at high temperature.

• Nicholas Appert-father of canning

• Food products such as meat, fish, fruits, vegetables

5. Bottling

•It is a method of preserving food in which the food contents are processed and sealed in airtight bottles at high temperature.

.Liquid foods like milk, wine etc.

6. Pasteurization

• It is the process of heating milk below boiling point (or any liquid or a food) to kill pathogenic bacteria to make the food safe to eat.

• Stops fermentation

• Named after Pasteur who introduced the technique

7. Refrigeration

•Keeping food at low temperatures or cold

. Remain unspoiled in refrigerator @ 40C

• Freezer temperature should be -180C

• Deep freezers @ -600C are good for storing meat and fish

8. Sterilization

• To remove microbes from food

• Milk sterilized by boiling at 100 0C

9. Dehydration

•The process of removal of water from food.

•Simplest and cheapest method

•Prevent microbial growth due to lack of water

• Fish, fruits etc can be stored

10. Lyophilization

• Rapid freezing and dehydration of frozen product under vacuum.

• Useful for storing, transporting and preserving food and bacterial culture

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